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  Domain Name: ubiquitin
Ubiquitin family. This family contains a number of ubiquitin-like proteins: SUMO (smt3 homologue), Nedd8, Elongin B, Rub1, and Parkin. A number of them are thought to carry a distinctive five-residue motif termed the proteasome-interacting motif (PIM), which may have a biologically significant role in protein delivery to proteasomes and recruitment of proteasomes to transcription sites.